Problem: You know, it's hard to conduct a show with lots of participants and spectators at the same place nowadays. Still, you are not giving up on your dream to make a car crash showcase! You decided to replace the real cars with remote controlled ones, call the event "Remote Control Kaboom Show" and stream everything online.

For the preparation you arranged an arena — an infinite 2D-field. You also bought n remote controlled cars and set them up on the arena. Unfortunately, the cars you bought can only go forward without turning left, right or around. So you additionally put the cars in the direction you want them to go.

To be formal, for each car i (1 ≤ i ≤ n) you chose its initial position (x_i, y_i) and a direction vector (dx_i, dy_i). Moreover, each car has a constant speed s_i units per second. So after car i is launched, it stars moving from (x_i, y_i) in the direction (dx_i, dy_i) with constant speed s_i.

The goal of the show is to create a car collision as fast as possible! You noted that launching every car at the beginning of the show often fails to produce any collisions at all. Thus, you plan to launch the i-th car at some moment t_i. You haven't chosen t_i, that's yet to be decided. Note that it's not necessary for t_i to be integer and t_i is allowed to be equal to t_j for any i, j.

The show starts at time 0. The show ends when two cars i and j (i ≠ j) collide (i. e. come to the same coordinate at the same time). The duration of the show is the time between the start and the end.

What's the fastest crash you can arrange by choosing all t_i? If it's possible to arrange a crash then print the shortest possible duration of the show. Otherwise, report that it's impossible.

Input

The first line contains a single integer n (1 ≤ n ≤ 25000) — the number of cars.

Each of the next n lines contains five integers x_i, y_i, dx_i, dy_i, s_i (-10^3 ≤ x_i, y_i ≤ 10^3; 1 ≤ |dx_i| ≤ 10^3; 1 ≤ |dy_i| ≤ 10^3; 1 ≤ s_i ≤ 10^3) — the initial position of the i-th car, its direction vector and its speed, respectively.

It's guaranteed that all cars start at distinct positions (i. e. (x_i, y_i) ≠ (x_j, y_j) for i ≠ j).

Output

Print the shortest possible duration of the show if it's possible to arrange a crash by choosing all t_i. Otherwise, print "No show :(".

Your answer is considered correct if its absolute or relative error does not exceed 10^{-6}.

Formally, let your answer be a, and the jury's answer be b. Your answer is accepted if and only if \frac{|a - b|}{max{(1, |b|)}} ≤ 10^{-6}.

Examples

Input


4
3 -1 -1 1 2
2 3 -3 -2 10
-4 2 1 -2 1
-2 -2 -1 2 4


Output


0.585902082262898


Input


2
-1 1 -1 1 200
1 1 1 5 200


Output


No show :(

Note

Here is the picture for the first example: 

<image>

The fastest cars to crash are cars 2 and 4. Let's launch car 2 at 0, car 4 at about 0.096762 and cars 1 and 3 at arbitrary time. That way cars 2 and 4 will crash into each other at about 0.585902. So here's what it looks like at the moment of the collision:

<image>

Here's the picture for the second example:

<image>

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
const int INFI = 1e9 + 5;
const long long int INFL = 4e18 + 5;
template <class T>
void aread(T* arr, int ___n) {
  for (int i = 0; i < ___n; ++i) {
    cin >> arr[i];
  }
}
template <class crd>
long long int sgn(const crd& x) {
  return x > ((crd)((long double)1e-9))      ? 1
         : x < ((crd) - ((long double)1e-9)) ? -1
                                             : 0;
}
template <class crd>
struct pt {
  crd x;
  crd y;
  pt& operator=(const pt& other) {
    x = other.x;
    y = other.y;
    return *this;
  }
  pt& operator+=(const pt& other) {
    x += other.x;
    y += other.y;
    return *this;
  }
  pt& operator-=(const pt& other) {
    x -= other.x;
    y -= other.y;
    return *this;
  }
  pt& operator*=(const crd& t) {
    x *= t;
    y *= t;
    return *this;
  }
  pt& operator/=(const crd& t) {
    assert(t != 0);
    x /= t;
    y /= t;
    return *this;
  }
  pt operator+(const pt& other) const { return pt<crd>(*this) += other; }
  pt operator-(const pt& other) const { return pt<crd>(*this) -= other; }
  pt operator*(const crd& t) const { return pt<crd>(*this) *= t; }
  pt operator/(const crd& t) const { return pt<crd>(*this) /= t; }
  operator pt<long double>() const {
    pt<long double> newpt;
    newpt.x = this->x;
    newpt.y = this->y;
    return newpt;
  }
};
template <class crd>
pt<crd> operator*(const crd& t, const pt<crd>& pt) {
  return pt * t;
}
template <class crd>
crd dot(const pt<crd>& l, const pt<crd>& r) {
  return l.x * r.x + l.y * r.y;
}
template <class crd>
crd norm(const pt<crd>& a) {
  return dot(a, a);
}
template <class crd>
long double abs(const pt<crd>& a) {
  return sqrtl(norm(a));
}
template <class crd>
crd cross(const pt<crd>& l, const pt<crd>& r) {
  return l.x * r.y - l.y * r.x;
}
template <class crd>
bool upper(const pt<crd>& a) {
  return ((a.y > 0) || (!a.y && a.x > 0));
}
template <class crd>
bool operator<(const pt<crd>& a, const pt<crd>& b) {
  if (upper(a) != upper(b)) return upper(a);
  return cross(a, b) > 0;
}
pt<long double> intersection(const pt<long double>& a1,
                             const pt<long double>& a2,
                             const pt<long double>& b1,
                             const pt<long double>& b2) {
  return a1 + ((a2 - a1) * cross(b1 - a1, b2 - b1) / cross(a2 - a1, b2 - b1));
}
template <class crd>
bool intersection1d(crd l1, crd r1, crd l2, crd r2) {
  if (l1 > r1) {
    r1 += l1;
    l1 = r1 - l1;
    r1 -= l1;
  }
  if (l2 > r2) {
    r2 += l2;
    l2 = r2 - l2;
    r2 -= l2;
  }
  return max(l1, l2) <= min(r1, r2) + ((crd)((long double)1e-9));
}
template <class crd>
bool segseg(const pt<crd>& a1, const pt<crd>& a2, const pt<crd>& b1,
            const pt<crd>& b2) {
  return intersection1d(a1.y, a2.y, b1.y, b2.y) &&
         intersection1d(a1.x, a2.x, b1.x, b2.x) &&
         sgn(cross(a1 - b1, b2 - b1)) * sgn(cross(a2 - b1, b2 - b1)) <= 0 &&
         sgn(cross(b1 - a1, a2 - a1)) * sgn(cross(b2 - a1, a2 - a1)) <= 0;
}
template <class crd>
long double polyarea(const vector<pt<crd>>& points) {
  int sz = points.size();
  long double res = 0;
  for (int i = 0; i < sz; ++i) {
    res += (long double)cross(points[i], points[(i == sz - 1) ? 0 : i + 1]);
  }
  return abs(res / 2.0);
}
long double evaluate_line(const pt<long double>& a, const pt<long double>& b,
                          long double x) {
  if (abs(a.x - b.x) < ((long double)1e-9)) {
    return a.y;
  }
  return a.y + (b.y - a.y) * (x - a.x) / (b.x - a.x);
}
const int maxn = 25e3 + 5;
int n;
struct car {
  pt<long double> o;
  pt<long double> d;
  long double s;
} cars[maxn];
typedef struct seg {
  pt<long double> s;
  pt<long double> e;
  int id;
} seg;
bool operator<(const seg& a, const seg& b) {
  long double ex = max(min(a.s.x, a.e.x), min(b.s.x, b.e.x));
  return evaluate_line(a.s, a.e, ex) <
         evaluate_line(b.s, b.e, ex) - ((long double)1e-9);
}
seg lines[maxn];
set<seg>::iterator prev(set<seg>::iterator it, const set<seg>& s) {
  return it == s.begin() ? s.end() : --it;
}
set<seg>::iterator next(set<seg>::iterator it, const set<seg>& s) {
  return ++it;
}
typedef struct ev {
  long double x;
  int type;
  int id;
} ev;
bool operator<(const ev& a, const ev& other) {
  if (abs(a.x - other.x) <= ((long double)1e-9)) {
    return a.type > other.type;
  }
  return a.x < other.x;
}
set<seg>::const_iterator where[maxn];
bool crash(long double m) {
  vector<ev> events;
  for (int i = 0; i < n; ++i) {
    lines[i].s = cars[i].o;
    lines[i].e = cars[i].o + cars[i].d * m;
    lines[i].id = i;
    events.push_back(ev{min(lines[i].s.x, lines[i].e.x), 1, i});
    events.push_back(ev{max(lines[i].s.x, lines[i].e.x), 0, i});
  }
  sort((events).begin(), (events).end());
  set<seg> ordering;
  for (auto e : events) {
    if (e.type == 1) {
      set<seg>::iterator up = ordering.lower_bound(lines[e.id]);
      set<seg>::iterator down = prev(up, ordering);
      if (up != ordering.end() &&
          segseg((*up).s, (*up).e, lines[e.id].s, lines[e.id].e)) {
        return true;
      }
      if (down != ordering.end() &&
          segseg((*down).s, (*down).e, lines[e.id].s, lines[e.id].e)) {
        return true;
      }
      where[e.id] = ordering.insert(lines[e.id]).first;
    } else {
      set<seg>::iterator up = next(where[e.id]);
      set<seg>::iterator down = prev(where[e.id]);
      if (up != ordering.end() && down != ordering.end() &&
          segseg((*up).s, (*up).e, (*down).s, (*down).e)) {
        return true;
      }
      ordering.erase(where[e.id]);
    }
  }
  return false;
}
int main() {
  const long double pers = 5e-7;
  cout << fixed << setprecision(20);
  cin >> n;
  for (int i = 0; i < n; ++i) {
    cin >> cars[i].o.x >> cars[i].o.y >> cars[i].d.x >> cars[i].d.y >>
        cars[i].s;
    cars[i].d /= abs(cars[i].d);
    cars[i].d *= cars[i].s;
  }
  long double l = ((long double)1e-9);
  long double h = 1e12;
  if (!crash(h)) {
    cout << "No show :(" << endl;
  } else {
    while (h - l > pers) {
      long double m = l + (h - l) / 2.0;
      if (crash(m)) {
        h = m - ((long double)1e-9);
      } else {
        l = m + ((long double)1e-9);
      }
    }
    cout << l << endl;
  }
}